Preheat the oven to 350 degrees. Grease a muffin tin with cooking spray and set aside.
In a large mixing bowl, combine the all-purpose baking mix, melted butter, egg, granulated sugar, and milk. Using a wooden spoon or silicone spatula, mix until everything is well combined and a smooth batter forms.
Next, add the shredded cheddar cheese and mix just until it is evenly distributed throughout the batter.
Spoon the batter into the prepared muffin tin, filling each muffin cup about two-thirds full.
Bake the cheese muffins in the preheated oven for 15-20 minutes, or until they are golden brown on top and a toothpick inserted into the center comes out clean.
Allow the muffins to cool in the tin for 5 minutes before transferring them to a wire rack to cool completely.
Notes
Leftover muffins can be stored in an airtight container at room temperature for up to 3-4 days.
I recommend shredding your own cheese if possible, as it melts better than store-bought shreds. Pre-packaged shreds will work if you're short on time.
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